Circuit-breaker



D. M. SQHWFERT. 7

CIRCUIT BR'EAKER.'

APPLICATION FILEDI DEC.'9 1916.

Patented Aug. 5, 1919..

UNITED sTATEs PATENT oEEIoE.

-DANIEL M.A SCHIFFERT, OF BOSTON, MASSACHUSETTS, ASSIGNOR T0 S. B. CONDIT, JR., 0F BROOKLINE, MASSACHUSETTS.

CIRCUIT-Banana Specification of Letters Patent.

' Patented Aug. 5', 1919.

Application led December 9, 1916. Serial No. 136,084.

To all 'whom t may concern.'

Be it known that. I, DANIEL M. SCHIFFERT, a citizen of the United States, residing at Boston, in the county oi' Suifolk and State of Massachusetts, have invented an Improvement in Circuit-Breakers, of which the'fol-v lowing is a specification.

This invention relates to circuit-breakers, and has for its object improvements in the construction of the same by which the eiiiciency of the circuit-breaker is increased, and its capacity, taking into account its dimensions, is augmented, and which may be easily and cheaply manufactured, and in the standardizing of its component parts whereby other circuit-breakers, of other capacities, may beeasily and cheaply manufactured.

My improvements reside particularly in the construction of the carbon contact-members and their supporting-means; and the construction of the stationary contact-members for the brush and for the movable secondary contact-members and their supporting-means; and the provision 'of a 'conducting element coextensive with the several stationary contact-members.

Figure 1 is a side elevation of a portion of the circuit-breaker embodying this invention.

Fig. 2 is a front elevation of a portion of the same.

Fig. 3 san enlarged vertical sectional detail of the several contact-members.

Fig. -4 is a front view ofthe same.

10 represents the movable Contact bearing,

member pivoted at'12, and 13 and 14, two toggle links connected with said member, and 15 the operating lever for the toggle connection by which the member 10 is moved into circuit-closing position. These elements together with the brush 16 are or may be all constructed in any usual or suitable manner. The upper end-portions of the sidearms of the pivoted member 10 are bent inward toward each other as at :20-20, and receive between them the flat-sided end-portion of a brush support which extends rearwardly, as at 22, beyond the member 10, and the brush 16 is rigidly secured to the eX- tremit of said rearwardly extended portion 22. his brush support is made as a casting, ofiron, but it may be otherwise made of any suitable material. By makinathe brush support as shown, the upper end-portion of the pivoted member 10 may be reduced in width' to the Width of .the Space occupied by said support, and two or more like supports may be arranged side by side on a single pole circuit breaker to form one of larger capacity without unduly increasing the width of the circuit breaker, and thus a circuit breaker of large capacity may of narrow dimensions.

The end-portion of the brush support is adapted to be arranged Hush with the front, and, if desired, with the edges of the upper end-portion' of the side frames of the pivoted member, so that its full width at the outside may be utilized for attachment thereto of the supporting arms 30 and 40 for the movable secondary and carbon contact members. These supporting arms, as here shown, each consist of a narrowflat strip of brass, copper or other suitable material, having their lower end-portions bent at 31, 41, to provide flat portions for the engagement with the outside of the brush support, and they extend over the edges of the side-frames of the pivoted member, beiA made of a width which may correspon to the full width of the brush support and side-frames. Said arms are or4 may be resilient and are divergently disposed relative to each other, as shown. The arm 30 bears a detachable and reversible secondary contact-member 32, theJ shank portion of which extends over the under side of the upper end-portion of the arm. The arm 40 has at its upper end-portion a pair of clamping-members composed of two opposing jaws 42, 43, adapted to engage the upper and lower sides of a carbon contact-member. One o'f said jaws, as 42, is formed by refleXin the end-portion of the arm in a rearward ownward direction to an inclined position with respect to the arm, which engages a transverse recess 51, formed in the top of the carbon contact-member 50; the other jaw as 43 is formed of a short separate piece of metal like the arm, bent intermediate its length, the lower end-portion of which flatly engages the arm, and is rigidly but detachably secured thereto, and the upper end-portion of which is extended in an upward, outward direction, inclined with respect to the arm, similar to the other jaw, and is adapted to engage a transverse recess 52, in the under side of the carbon contact-member 50. Thus it will be seen that said carbon contact-member will be rigidly held in place by said jaws.

The carbon contact-member is made wider than its supporting-arm, and the transverse recesses extend only along the middle portions of the top and bottom sides thereof, so that said contact-member is revented from lateral movement by the ]aws A.Opposing jaws, similar to vthe aforesaid jaws, are provided for stationarily engaging said member to hold it in fixed position.

The upper jaw is formed at the upper end-'portion of a bearing plate 80 by reflexing said upper end-port1on in a downwardlyinclined direction, with respect to the plate, and said jaw and plate are made of a width corresponding to the length of the transverse recess 61. The lower jaw 66 is formed as a separate short piece of metal, of the same width'as the upper jaw, and is bent intermediate its length to' provideva flat lower end-portion for engagement and detachable connection 'with the plate, and the upwardly inclined portion. These two opposing jaws, therefore, hold the carbon contact-member 60 securely, the same as the opposing jaws hold the other carbon contactmember.

The screw 67 which holds the lower jawmember may extend through the bearing plate 80, and enter a recess in the back plate of the circuit breaker. The stationary secondary contact-member 10 is made as an angularly formed plate, of a strip of' copper or other material, bent substantially' U- shaped, and the crown of said member .76 is arranged ou of and engagement with the statioua contact-member i5 the brush, a dly secured ul i a screw "i6, ente iroug stationary cout nemleer 'dit right o shaped is" inst sais;

vided down;

member 75, and said stud extends through a hole in the back plate of the circuit-breaker vand has a screw-threaded end which receives upon it a nut 87. A shoulder 89 is or ma 'be formed at the junction of the screxV threaded endsportion 86 and the shan which shoulder engages'the back of the co tact-member, the plate 80 having a hI through it large enough in diameter to admit of the shank of the stud extending through it. To assist in holding the contact-member in place, particularly while the nut' on the screw-'bolt is being tightened, said contact member 75 may have a steadypin- 79 projecting rearward from it adapted 'to enter a hole in the back plate.

I claim l. A circuit breaker including stationaryl switch members, a pivoted contact-bearing member composed of two side frames, a block rigidly secured between the upper endortions of said frames and substantially ush with the forward edges thereof, and extended rearwardly of said upper end portions, a brush Contact member for cooperation with certain of said stationary switch-members rigidly fixed to said block, and auxiliary contact-members secured to the front side of said block and extended thereabove for conthereby p-reve ateral displacement said is secured to said supporting plate againstV lateral displacement therefrom.

5. In a circuit-breaker, a carbon contactl member, a supporting arm therefor, said-= contact member having a width greater than th'ewidth of said supporting arm and having recesses therein of a width substantially equal to the-width of said vsupporting arm,

and vsaid supporting arm having l,an vend thereof reflexed into a recess in sald contact member whereby saidl contact member -is vSecured to said arm and restrained from lateral movement therewith, and a jaw member detachably secured to said supporting arm' and extended into a recess of said contact member for clamping engagement' therewith.

6. A circuit-breaker havin a stationary brush contact-member, a statlonarysecondary contact-member, and a ystationary car-4 bon contact-member,andaseparate plate of conducting material made coextensive with the said members arranged 1n: engagement therewith, thus to electricallysl connect said members, and a stud for attaching said stai tionary contact-member to the back-board, its inner screw-threaded end-portion extending through the plate and stationary brush y tended through and contact-member, andasteady pin arranged on the back of the stationary brush contact member adapted to enter a hole inthe back- I board-tp preventJ rotation 'of said brush contact member as said stud is clamped to the back-board.

7. A` circuit-breaker having stationary contact-members for the brush and the sec- .ondary contaeti-lmember, and having a stationar carbon contact-member, and a separate p ate of conducting materialmade coeXtensive with the said membersv arranged in engagement therewith,"said plate bearing a pair of opposing jaws for the ycarbon contact-member, one of said jaws being detach- DANIEL M. SCHIFFERT.

Witnesses:

RUSSELL J. NEAGLE,

A. CALDER. 

